Dental-engine plugger or mallet.



J. P. KELLEY. DENTAL ENGINE PLUGGER OB MALLBT.

APPLICATION FILED OCT. 28, 1907.

7 fizz/ani Vc tne d 666 wawm %m0yd PATENT OFFICE.

,JESSE.P.1KELLEY, OF GENEVA, OHIO.

' A DEN'lAL-ENGINE *PLUGGEW 0R "'MZALLET.

Specification of Letters Patent.

Q Patented Dec. 29,, 19.08.

Application; filed. ;October :28, 21907.. ;Seria1'No'.{399,440.

To all whom it may concern: ...Be' it known. that I, JEssi1-:PJKELLEY, a

citizen? of; theiUnited-States;,residing-atfienova, jinthe countyi of:AshtabulaandgState plfiOnio, haveginvented certainnew anduse' in dental'engine pluggers of that-type thatstrike a right-angled blow; and has 'for its object to produce a deviceofthiskindwhich is simple in its construction and operation,

and convenient of manipulation; and-which is capable of dealing a variety of blows.

A further object-of my invention is to provide an automatic dental plugger or mallet with which parts of the mouth inaccessible withstraight action pluggers: may be readily reached, and cavitiesin the posterior lobes of the-teeth easily filled.

The invention resides in certain novel features of construction hereinafter 'de- 7 scribed and pointed out in the claims at'the end of this specification; and the invention is also fully illustrated inthe accompanying drawings, vin which like letters'and'figu-res indicate like parts ,throughout the several views.

In said drawings, Figure 1 represents a side elevationof my improved dental 'plugger-inclosed in its casing. Fig.2 is a longitudinal vertical section,;showing the mechanism of my improved device with the plugger headraised. Fig; 3 is; a side elevation without the case showing the plugger-head down, and the -adjustable-=wedge, by means of which the length of the'stroke dealtby the pluggerhead is varied, removed. Fig.4-is a vertical cross-section through the casing on theline 4'4 inFig. 3, looking in the direction of the arrow. Fig. 5 is a detail viewof the plugger-head. Fig; 6 is a detail perspective view of the-adjustable wedge, which regulates thelengthof the-stroke of the plugger-head; and Fig. 7 is a similar view of the cam and part of the shaft which connects with the motor.

Referring now to the drawings, A represents the case which incloses and protects the mechanism for operating the plugger. This case is fastened by screws to the foundation plate B, and a plug E, which is inserted into the open end of the case. A little forward of the middle of the plate B, which extends throughout the length of, the case, is

. Improvements-fin Dental EnginegPlug-T gers-ior Mallets; of -whichthe followingris. a v specification.

My invention appertains toimprovements rigidly secured the standard- 12; "and vfasrtened to'thegstandard b and the plugfE' -isythe top plate'T. ThefplugpE'h-as' asrearwardi'y extending,- -andeXl teriorly threaded tubeor projection -e, on whichiis screwedasmall sleeve F,--'rthepurpose-iof which will subsequently-appear. The mechanism so far de 1 scribedkconstitutes' the frame of the instrument, in' which the operating parts, consisting chiefly of a rotating shaftandcamyactuating a plugger-head, are mounted.

As shownin Figs. 2-, 3, and 4, j-ournaled in thestandard I); and, the plug E, is the rotary shaft O,=which extends rearwardly through the sleeve F, and which is adapted to be connected with-any suitable motor. The-sleeve F serves to protect theexposed portion of the shaft, and is split so asto firmly grip-the bitstock of the-motor, and still admit of easy removal.

'The'shaft O has attached to its forward end a camW,=and secured'to the shaft C, immediately to the rearofthe standard his the collar G,the function of which is, in conjunctionwith the cam W, :to restrain the shaft from any longitudinal movement.

Mounted inthe fore-part 0f the foundation plate B and top plate Tisthepluggerhea'dI-I, havingan rupwardlyexten ing arm h passing through a'suitable aperture'inthe top plate T, and a downwardly extending arm- 71/ which passes through an a erture adapted thereto, in the foundation p ateB. The up er-arm hof said lugger-head is preferab y-made of a cylind ical form, and the lower arm "h,thereof-,'is preferably made rectangularin form,so;-as to prevent the plugger-head from turning. Thearm' h serves-as a bit-stock and carries the lugger point P. Thecentral portion of the p uggeread I-I is enlarged, and projecting inwardly of this enlargement is a lip L, adapted to e engaged by thecam W. ,Secured to the to plate T-is theflat metal springs, which ears *on'the upper arm h of said plugger-head H, and serves to keep the lip Lin contact with the cam W.

In order to vary the len'gth'of the-stroke of the plugger-head and the point ca1*ried;there-' by, I provide awedge J, disposed in a suitably formed recess R in the standard I), and which is susce tible of longitudinal adjustment. The we ge J has formed thereon a series of steps K adapted to coincide with the inner from the top) side and the lower surface of the enlarged portion of the plugger-head H, the same being conformed to fit said steps. Said wedge is adjusted by means of the push-piece O, which is secured to said wedge by a screw 0, passing through a slot in the casing and into the wedge.

JV hen the instrument is in motion, the operator governs the blow of the plugger-point by sliding the push-piece 0, back and forth along the casing, and the wedge J in response to the motion of the push-piece, slides under the enlarged portion of the plugger-head H, and prevents the same from making a full stroke, the stroke being thus varied according to the hei ht of the different steps.

The instrument operates as follows: The shaft 0 is connected with a motor or dental engine whereby it is rotated, and the cam rotating with the shaft intermittently, forces the plugger-head up by means of the lip L, to the top of its stroke; when the cam has made a revolution, the plugger-head is released from its upward position, and forced down by the spring S; the plugger-head being thus given a reciprocating motion.

Having described my invention, what I claim and desire to secure by Letters Patent of the United States is:

1. In a dental engine plugger the combi nation With a suitable casing, of a frame seated therein; a rotary shaft mounted in said frame; a cam attached to said shaft; a spring-actuated lugger-head mounted in said frame in a p ane at right angles to the axis of the shaft, and having a lip adapted to be engaged by said cam; and a movable device for varying the force of the blow dealt by the plugger-head.

2. In a dental engine plugger, the combination with a suitable frame, of a rotating shaft mounted therein; a cam attached to said shaft; a pluggenhead providid with a projecting lip adapted to be engaged by said cam; and a spring mountrd to bear on said lugger-head, whereby said plugger-head is forced downward and maintaine d in a position in which the lip thereon is in the plane of rotation of the said cam.

3. In a dental engine plugger, the combination with a suitable frame, of a rotating shaft mounted therein; a cam fixed to said shaft; a plugger-head having a projecting lip adapted to engage with said cam; means for kee ing said lip in the plane of rotation of sai cam; and means for varying the length of tee stroke of the plugger-head.

4. In a dental engine plugger, the combination with a suitable frame and casing inclosing the frame, of a rotating shaft and cam; a plugger-head having an enlarged portion provided witn a projecting lip adapted to be engaged by said cam; means for holding said lip in operative connection with the cam; means for varying the length of the stroke of the hugger-head, consisting of an adjustable we go having a series of steps formed thereon; and means for sliding said steps under the enlarged portion of the plugger-hea d.

5. In a dental engine plugger, the herein described plugger-head having an enlarged portion provid d with a laterally projecting lip, and an upwardly extending and a downwardly extending arm, said latter arm being provided with means for mounting a plugging tool.

6. In a dental engine plugger, the combination with. a frame consisting of the foundation plate B having the standard h, the end plug E and top plate T, of a rotary shaft mounted in said standard and plug; a cam fixed to said shaft; the pluggcr-head ll having the lip L, and the upwardly extending cylindrical arm h and the downwardly extending rectangular arm 71/, journalr d respectively in correspondingly shaped apertures in said top plate and foundation plate; and the spring S secured to said top plate and bearing on the upper arm of said )luggerhead and forcing said plugger-hezld downward so as to bring the lip thereon into contact with said cam.

7. In a dental engine plugger, the combination of a frame consisting of a fournlrrtion plate B having the standard b, the plug l9 and top plate T, and a casing inclosing said frame, of a rotary shaft journalcd in said standard and plug; a cam fixed to said shaft; the reciprocating plugger-herd H mounted in the forward end of said frame and having means for mounting a plugging tool, and an enlargcd portion with a laterally projecting lip adapted to be engaged by said cam; a spring forcing said plugger-he: d downward and holding the lip thereon and said cam in engagement; and means for regulating the blow of the plugger-head comprising a wedge J, having steps K formed thereon, disposed in a recess in the standard I), and adapted to slide on the foundation plate; and a pushpiece 0 slidably mounted on the casing, and connected throrrgh a longitudinal slot in the casing, with the said wedge.

JESSE I KELLEY.

\Vitnesses I'IENRY' MnANs, J. C. KELLEY. 

